fix(event_session): restore event_presentation/presenter_li_qry_str fields

These fields from v_event_session_w_file_count were lost during the v1/v2
-> v3 migration. Added to Event_Session_Base model and to searchable_fields
in the event_session object definition.

Fields are only available via the alt view (v_event_session_w_file_count).
To search: use ?view=alt on the nested search endpoint.
To retrieve: use ?inc_file_count=true on the GET endpoint.

Also:
- Updated ARCH__V3_DEVELOPMENT_STANDARDS.md: expanded Field Evolution
  Checklist with alt-view field rules, Docker restart requirement, and
  documented the ?view= parameter as a live (not proposed) feature.
- Updated TODO__Agents.md: marked migration gap audit as complete.
- Added regression test to test_e2e_v3_search_engine.py.

documentation/ARCH__V3_DEVELOPMENT_STANDARDS.md

@@ -45,14 +45,25 @@ When a table or view gains, loses, or renames fields, keep the API contract and
 3. Update `searchable_fields` in `app/object_definitions/` only for fields that should be searchable.
 4. Add write-only, virtual, or view-only fields to `fields_to_exclude_from_db` when they must not be persisted.
 5. Run the schema/search E2E tests that cover the object type before handing the change off.
+6. **Restart the Docker API containers** (`docker compose restart ae_api`) — Python file changes inside containers are not picked up until restart.
 
 For `archive_content`, the public field set now includes `external_id` and `code`, and future additions should follow the same order of operations.
 
-### Response Views (Proposed)
--   Implement a `view` parameter (e.g., `?view=rich`) to allow clients to request joined data without using legacy `use_alt_tbl` flags.
+#### Alt-view fields (fields only in `tbl_alt`)
+Some objects have a richer alternate SQL view (`tbl_alt`) that adds JOINed/computed columns absent from the default view (`tbl_default`). For example, `event_session` uses `v_event_session_w_file_count` as its alt view (triggered by `?view=alt` on search, or `?inc_file_count=true` on GET).
+
+- Fields from `tbl_alt` **must still be declared in the Pydantic model** and in `searchable_fields` — Pydantic strips undeclared fields, and the search whitelist rejects unknown field names regardless of the view.
+- When adding such a field, add a comment noting which view provides it (e.g., `# from v_event_session_w_file_count`).
+- Searching by an alt-view field on the default endpoint returns `400 Unknown column` — this is correct behaviour. Clients must pass `?view=alt` to use those fields in a search.
+- **Known alt-view fields restored May 2026:** `event_presentation_li_qry_str`, `event_presenter_li_qry_str` (event_session); `account_name`, `account_code`, and related convenience fields (site_domain).
+
+### Response Views (`?view=` parameter)
+-   The nested search router (`api_crud_v3_nested.py`) already supports `?view=<key>` to switch between registered views. `view=default` uses `tbl_default`; `view=alt` uses `tbl_alt`; additional named views can be added to the object registry as `tbl_<name>` / `mdl_<name>`.
+-   Flat search (`api_crud_v3.py`) does not yet support `?view=` — it always uses `tbl_default`.
 
 ## 4. Stability Rules
 
 1.  **Baby Step Testing**: Restart Docker and verify root health after *every* modular change.
 2.  **Avoid Shadowing**: Never name a module part of the `app.` package the same as a common instance variable (e.g., avoid `app.middleware` package if you use `app = FastAPI()`).
 3.  **Deferred Imports**: Use `from app.db_sql import ...` *inside* functions in library modules to prevent circular dependency traps.
+4.  **Model changes require container restart**: Editing Python files on the host does not hot-reload inside Docker. Always run `docker compose restart ae_api` after model or object-definition changes, then re-run E2E tests.

documentation/TODO__Agents.md

@@ -34,6 +34,7 @@
     - [x] Whitelist `account_id` in all Event search definitions.
     - [x] Audit Relational "Low-Priority" Models (Address, Contact, DataStore).
     - [x] **V3 Uniform Lookup System:** Phase 1 & 2 Complete.
+    - [x] **Restore alt-view convenience fields lost in v1→v3 migration (May 2026):** `site_domain` (`account_name`, `account_code`, `account_enable`, `account_enable_from/to`, `site_enable_from/to`, `site_domain_access_key`, `logo_path`, `style_href`, `script_src`, `google_tracking_id`) and `event_session` (`event_presentation_li_qry_str`, `event_presenter_li_qry_str`). Fields added to Pydantic models and `searchable_fields`. Alt-view fields require `?view=alt` for search.
     - [ ] Verify SQL Views join in all required `_random` IDs for performance.
 - [ ] **Step 2:** Coordination (Verify Frontend uses `x-account-id` instead of token).
 - [ ] **Step 3:** Frontend V3 WebSocket integration test — queued after IDAA-specific work. Backend is ready (auth wired, heartbeat presence refresh confirmed, unit tests passing). Frontend guide updated at `GUIDE__AE_API_V3_for_Frontend_websockets.md`.